Defeating Dagon
To defeat Dagon, the boss of the second school looking portrait you must have obtained the Dark Rift spell from Vincent. When Dagon sucks in all the water then is about to spt it out cast dark rift and all the water will be sucked right in to the black hole and no damge will have been done to you. From there just repeat that and be sure to use the Rose Stem Whip because although that is not what it says he is weak to and it's not a very good weapon for some reason does pretty good damage to him.
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